(function( $ ){
    // 当domReady的时候开始初始化
    $(function() {
    	
		var $wrap = $('#uploader'),
		// 图片容器
		$queue = $( '<ul class="filelist"></ul>' )
		.appendTo( $wrap.find( '.queueList' ) ),
		
		$dndArea = $wrap.find("#dndArea"),
		// 状态栏，包括进度和控制按钮
		$statusBar = $wrap.find( '.statusBar' ),
		
		// 文件总体选择信息。
		$info = $statusBar.find( '.info' ),
		
		// 上传按钮
		$upload = $wrap.find( '.uploadBtn' ),
		
		// 没选择文件之前的内容。
		$placeHolder = $wrap.find( '.placeholder' ),
		
		$progress = $statusBar.find( '.progress' ).hide(),
		
		$filePicker = $wrap.find('#filePicker'),
		
		// 添加的文件数量
		fileCount = 0,
		
		// 添加的文件总大小
		fileSize = 0,
		
		// 优化retina, 在retina下这个值是2
		ratio = window.devicePixelRatio || 1,
		
		// 缩略图大小
		thumbnailWidth = 110 * ratio,
		thumbnailHeight = 110 * ratio,
		
		// 可能有pedding, ready, uploading, confirm, done.
		state = 'pedding',
		
		// 所有文件的进度信息，key为file id
		percentages = {},
		// 判断浏览器是否支持图片的base64
		isSupportBase64 = ( function() {
			var data = new Image();
			var support = true;
			data.onload = data.onerror = function() {
				if( this.width != 1 || this.height != 1 ) {
					support = false;
				}
			}
			data.src = "";
			return support;
		} )(),
		
		// 检测是否已经安装flash，检测flash的版本
		flashVersion = ( function() {
			var version;
			
			try {
				version = navigator.plugins[ 'Shockwave Flash' ];
				version = version.description;
			} catch ( ex ) {
				try {
					version = new ActiveXObject('ShockwaveFlash.ShockwaveFlash')
					.GetVariable('$version');
				} catch ( ex2 ) {
					version = '0.0';
				}
			}
			version = version.match( /\d+/g );
			return parseFloat( version[ 0 ] + '.' + version[ 1 ], 10 );
		} )(),
		
		supportTransition = (function(){
			var s = document.createElement('p').style,
			r = 'transition' in s ||
			'WebkitTransition' in s ||
			'MozTransition' in s ||
			'msTransition' in s ||
			'OTransition' in s;
			s = null;
			return r;
		})(),
		
		del_btn = $wrap.find( 'input[for-format=empty-uploader]' ),
		
		$initBtn = $wrap.find( 'input[for-format=reload-uploader]' ),
		
		// WebUploader实例
		uploader;
		
		// 实例化
		uploader = WebUploader.create({
			pick: {
				id: $filePicker,
				label: '点击添加'
			},
			auto :true,
			formData: {
				portrait: 0
			},
			dnd: $queue,
			paste: $wrap,
			swf: 'static/plugins/webuploader/dist/Uploader.swf',
			chunked: false,
			chunkSize: 512 * 1024,
			server: 'uploadFile',
			accept: {
				title: 'Images',
				extensions: 'gif,jpg,jpeg,bmp,png',
				mimeTypes: 'image/*'
			},
			
			// 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开。
			disableGlobalDnd: true,
			fileNumLimit: 1,
			fileSizeLimit: 200 * 1024 * 1024,    // 200 M
			fileSingleSizeLimit: 50 * 1024 * 1024    // 50 M
		});
		
		// 拖拽时不接受 js, txt 文件。
		uploader.on( 'dndAccept', function( items ) {
			var denied = false,
			len = items.length,
			i = 0,
			// 修改js类型
			unAllowed = 'text/plain;application/javascript ';
			
			for ( ; i < len; i++ ) {
				// 如果在列表里面
				if ( ~unAllowed.indexOf( items[ i ].type ) ) {
					denied = true;
					break;
				}
			}
			
			return !denied;
		});
		
		uploader.on('ready', function() {
			window.uploader = uploader;
		});
		
		// 当有文件添加进来时执行，负责view的创建
		function addFile( file ) {
			var $li = $( '<li id="' + file.id + '">' +
					'<p class="title">' + file.name + '</p>' +
					'<p class="imgWrap"></p><div class="input-container"></div>'+
			'</li>' ),
			
			$btns = $('<div class="file-panel">' +
					'<span class="cancel">删除</span>' +
					'<span class="rotateRight">向右旋转</span>' +
			'<span class="rotateLeft">向左旋转</span></div>').appendTo( $li ),
			$wrap = $li.find( 'p.imgWrap' ),
			
			showError = function( code ) {
				switch( code ) {
				case 'exceed_size':
					text = '文件大小超出';
					break;
					
				case 'interrupt':
					text = '上传暂停';
					break;
					
				default:
					text = '上传失败，请重试';
				break;
				}
				
				$info.text( text ).appendTo( $li );
			};
			
			if ( file.getStatus() === 'invalid' ) {
				showError( file.statusText );
			} else {
				// @todo lazyload
				$wrap.text( '预览中' );
				uploader.makeThumb( file, function( error, src ) {
					var img;
					
					if ( error ) {
						$wrap.text( '不能预览' );
						return;
					}
					
					if( isSupportBase64 ) {
						img = $('<img src="'+src+'">');
						$wrap.empty().append( img );
					} else {
						$.ajax('../../server/preview.php', {
							method: 'POST',
							data: src,
							dataType:'json'
						}).done(function( response ) {
							if (response.result) {
								img = $('<img src="'+response.result+'">');
								$wrap.empty().append( img );
							} else {
								$wrap.text("预览出错");
							}
						});
					}
				}, thumbnailWidth, thumbnailHeight );
				
				percentages[ file.id ] = [ file.size, 0 ];
				file.rotation = 0;
			}
			
			$li.on( 'mouseenter', function() {
				$btns.stop().animate({height: 30});
			});
			
			$li.on( 'mouseleave', function() {
				$btns.stop().animate({height: 0});
			});
			
			$btns.on( 'click', 'span', function() {
				var index = $(this).index(),
				deg;
				
				switch ( index ) {
				case 0:
					uploader.removeFile( file );
					return;
					
				case 1:
					file.rotation += 90;
					break;
					
				case 2:
					file.rotation -= 90;
					break;
				}
				
				if ( supportTransition ) {
					deg = 'rotate(' + file.rotation + 'deg)';
					$wrap.css({
						'-webkit-transform': deg,
						'-mos-transform': deg,
						'-o-transform': deg,
						'transform': deg
					});
				} else {
					$wrap.css( 'filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ (~~((file.rotation/90)%4 + 4)%4) +')');
				}
			});
			
			$li.appendTo( $queue );
		}
		
		//建立外部网页媒介，使得其他js文件能够访问内部方法
		//重加载ImgList，图片回显
		$initBtn.on( 'click', function() {
			var upId = $initBtn.attr("id");
			var upUrl = $initBtn.attr("url");
			var delUrl = $initBtn.attr("delUrl");
			$.ajax({
				url:upUrl,
				type:"GET",
				data:{
					id:upId
				},
				success:function(data){
					initEditList();
					data = eval("("+data+")");
					if(data.res == 1){
						var vals = data.obj;
						if(vals != null){
							if(vals.cover == "" || vals.cover == null || vals.cover == 'undefined')return;
							var fullPath = vals.cover;
							var newsId = vals.id;
							getImgToBase64(fullPath, function(data){
								$(".uploader-container").find("#dndArea").addClass("element-invisible");
								$(".uploader-container").find(".statusBar").removeClass("element-invisible");
								$(".uploader-container").find(".filelist").css("display","block");
								var $li = $( '<li relId="' + newsId + '" >' +
										'<p class="title"></p>' +
										'<p class="imgWrap"><img src="'+data+'"></p>' +
								'<div class="input-container"><input type="hidden" name="cover" value="'+ fullPath +'"></div></li>' ),
								$btns = $('<div class="file-panel">' +
								'<span class="cancel">删除</span></div>').appendTo( $li );
								
								$li.on( 'mouseenter', function() {
									$btns.stop().animate({height: 30});
								});
								
								$li.on( 'mouseleave', function() {
									$btns.stop().animate({height: 0});
								});
								
								$btns.on( 'click', 'span', function() {
									var relId = $(this).parent().parent().attr("relId");
									$.ajax({
										url:delUrl,
										data:{
											id:relId
										},
										success:function(data){
											$queue.find($li).remove();
											fileCount --;
											if(fileCount == 0){
												$(".uploader-container").find("#dndArea").removeClass("element-invisible");
												$(".uploader-container").find(".statusBar").addClass("element-invisible");
												$(".uploader-container").find(".filelist").css("display","none");
											}
										},
										error:function(err){
											alert("删除失败");
											console.log(err);
										}
									});
								});
								
								$li.appendTo($(".uploader-container").find(".filelist") );
								fileCount ++;
								
								var t = '共' + fileCount + '张（' +
								WebUploader.formatSize( fileSize )  +
								'），已上传' + 0 + '张';
								
								$info.text(t);
							})
						}
					}
				},
				error:function(err){
					console.log(err);
				}
			});
		} );
		function initEditList(){
			$queue.find("li").remove();
			fileCount = 0;
			fileSize = 0;
			$dndArea.removeClass("element-invisible");
			$statusBar.addClass("element-invisible");
			$queue.css("display","none");
		}
		function getBase64Image(img) {
		    var canvas = document.createElement("canvas");
		    canvas.width = img.width;
		    canvas.height = img.height;
		    var ctx = canvas.getContext("2d");
		    ctx.drawImage(img, 0, 0, img.width, img.height);
		    var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
		    return canvas.toDataURL("image/"+ext);
		}
		
		function getImgToBase64(url,callback){//将图片转换为Base64
			var canvas = document.createElement('canvas'),
			ctx = canvas.getContext('2d'),
			img = new Image;
			img.crossOrigin = 'Anonymous';
			img.src = url;
			img.onload = function(){
				canvas.height = img.height;
				canvas.width = img.width;
				ctx.drawImage(img,0,0);
				var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
				var dataURL = canvas.toDataURL("image/"+ext);
				callback(dataURL);
				canvas = null;
			};
		}
		function dataURLtoFile(dataurl, filename) {//将base64转换为文件
		    var arr = dataurl.split(','),
		    	mime = arr[0].match(/:(.*?);/)[1],
		    	bstr = atob(arr[1]),
		    	n = bstr.length,
		    	u8arr = new Uint8Array(n);
		    while(n--){
		        u8arr[n] = bstr.charCodeAt(n);
		    }
		    return new File([u8arr], filename, {type:mime});
		}
		// 负责view的销毁
		function removeView( file ) {
			var $li = $('#'+file.id);
			delete percentages[ file.id ];
			updateTotalProgress();
			$li.off().find('.file-panel').off().end().remove();
		}
		// 负责view的销毁
		function removeFile( file ) {
			var $li = $('#'+file.id);
			var itemId = $li.find("input[name='cover']").attr("value");
			delete percentages[ file.id ];
			updateTotalProgress();
			$li.off().find('.file-panel').off().end().remove();

		}
		
		function updateTotalProgress() {
			var loaded = 0,
			total = 0,
			spans = $progress.children(),
			percent;
			
			$.each( percentages, function( k, v ) {
				total += v[ 0 ];
				loaded += v[ 0 ] * v[ 1 ];
			} );
			
			percent = total ? loaded / total : 0;
			
			
			spans.eq( 0 ).text( Math.round( percent * 100 ) + '%' );
			spans.eq( 1 ).css( 'width', Math.round( percent * 100 ) + '%' );
			updateStatus();
		}
		
		function updateStatus() {
			var text = '', stats;
			
			if ( state === 'ready' ) {
				text = '选中' + fileCount + '张图片，共' +
				WebUploader.formatSize( fileSize ) + '。';
			} else if ( state === 'confirm' ) {
				stats = uploader.getStats();
				if ( stats.uploadFailNum ) {
					text = stats.successNum+ '张成功，'+
					stats.uploadFailNum + '张失败'
				}
				
			} else {
				stats = uploader.getStats();
				text = '共' + fileCount + '张（' +
				WebUploader.formatSize( fileSize )  +
				'），已上传' + stats.successNum + '张';
				
				if ( stats.uploadFailNum ) {
					text += '，失败' + stats.uploadFailNum + '张';
				}
			}
			
			$info.html( text );
		}
		
		function setState( val ) {
			var file, stats;
			
			if ( val === state ) {
				return;
			}
			
			$upload.removeClass( 'state-' + state );
			$upload.addClass( 'state-' + val );
			state = val;
			
			switch ( state ) {
			case 'pedding':
				$placeHolder.removeClass( 'element-invisible' );
				$queue.hide();
				$statusBar.addClass( 'element-invisible' );
				uploader.refresh();
				break;
				
			case 'ready':
				$placeHolder.addClass( 'element-invisible' );
				$( '#filePicker2' ).removeClass( 'element-invisible');
				$queue.show();
				$statusBar.removeClass('element-invisible');
				uploader.refresh();
				break;
				
			case 'uploading':
				$( '#filePicker2' ).addClass( 'element-invisible' );
				$progress.show();
				$upload.text( '暂停上传' );
				break;
				
			case 'paused':
				$progress.show();
				$upload.text( '继续上传' );
				break;
				
			case 'confirm':
				$progress.hide();
				$( '#filePicker2' ).removeClass( 'element-invisible' );
				$upload.text( '开始上传' );
				
				stats = uploader.getStats();
				if ( stats.successNum && !stats.uploadFailNum ) {
					setState( 'finish' );
					return;
				}
				break;
			case 'finish':
				stats = uploader.getStats();
				if ( stats.successNum ) {
					console.log( '上传成功' );
				} else {
					// 没有成功的图片，重设
					state = 'done';
					location.reload();
				}
				break;
			}
			
			updateStatus();
		}
		
		uploader.onUploadProgress = function( file, percentage ) {
			var $li = $('#'+file.id),
			$percent = $li.find('.progress span');
			
			$percent.css( 'width', percentage * 100 + '%' );
			percentages[ file.id ][ 1 ] = percentage;
			updateTotalProgress();
		};
		
		uploader.onFileQueued = function( file ) {
			fileCount++;
			fileSize += file.size;
			
			if ( fileCount === 1 ) {
				$placeHolder.addClass( 'element-invisible' );
				$statusBar.show();
			}
			
			addFile( file );
			setState( 'ready' );
			updateTotalProgress();
		};
		
		uploader.onFileDequeued = function( file ) {
			fileCount--;
			fileSize -= file.size;
			
			if ( !fileCount ) {
				setState( 'pedding' );
			}
			
			removeFile( file );
			updateTotalProgress();
			
		};
		
		uploader.on( 'all', function( type ) {
			var stats;
			switch( type ) {
			case 'uploadFinished':
				setState( 'confirm' );
				break;
				
			case 'startUpload':
				setState( 'uploading' );
				break;
				
			case 'stopUpload':
				setState( 'paused' );
				break;
				
			}
		});
		
		uploader.onError = function( code ) {
			alert( 'Eroor: ' + code );
		};
		
		uploader.on('uploadSuccess',function(file,json){
			var $li = $('#'+file.id);
			var input = '<input type="hidden" for-multi="fileRel" name="fileId" value="'+json.fileId+'">';
			input += '<input type="hidden" for-multi="fileRel" name="remark" value="cover">';
			input += '<input type="hidden" for-multi="fileRel" name="fileType" value="image">';
			input += '<input type="hidden" for-multi="fileRel" name="fileFile" value="'+json.saveName+'">';
			input += '<input type="hidden" for-multi="fileRel" name="urlInfor" value="'+json.savePath+'">';
			input += '<input type="hidden" name="cover" value="'+ (json.savePath + json.saveName)+'">';
			$li.find(".input-container").append(input);
		});
		
		$upload.on('click', function() {
			if ( $(this).hasClass( 'disabled' ) ) {
				return false;
			}
			
			if ( state === 'ready' ) {
				uploader.upload();
			} else if ( state === 'paused' ) {
				uploader.upload();
			} else if ( state === 'uploading' ) {
				uploader.stop();
			}
		});
		
		$info.on( 'click', '.retry', function() {
			uploader.retry();
		} );
		
		$info.on( 'click', '.ignore', function() {
			alert( 'todo' );
		} );
		
		$upload.addClass( 'state-' + state );
		updateTotalProgress();
		
		//建立外部网页媒介，使得其他js文件能够访问内部方法
		del_btn.on( 'click', function() {
			var isRemoveView = del_btn.attr("removeView");
			closeUploader(isRemoveView);
		} );
		function closeUploader() {        
			// 移除所有缩略图并将上传文件移出上传序列
		    for (var i = 0; i < uploader.getFiles().length; i++) {
		    	// 将图片从上传序列移除
		    	uploader.removeFile(uploader.getFiles()[i]);
		    	//uploader.removeFile(uploader.getFiles()[i], true);
		    	//delete uploader.getFiles()[i];
		    	// 将图片从缩略图容器移除
		    	var $li = $('#' + uploader.getFiles()[i].id);
		    	$li.off().remove();

		    }
		    setState('pedding');
		    
		    // 重置文件总个数和总大小

		    fileCount = 0;

	        fileSize = 0;

		    // 重置uploader，目前只重置了文件队列
		    uploader.reset();

		    // 更新状态等，重新计算文件总个数和总大小
		    updateStatus();

		}
    });

})( jQuery );